Universal feed mechanism for sewing machines



Jr: GOLDBERG.

UNIVERSAL FEED MECHANISM FOR SEWlNG MACHINES.

' APPLICATIDN FILED AUG-2, 1920 1,438,593,, Patented Dec. 12, 1922.

Patented ea. 12, 1922.

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a plicationnieaau u taiaao; semis). 409,575;

To all whom it may concern Be it known thatl, JACOB; citizen of the United States of America, and resident of Cincinnati, in the" county of Hamilton and State. of Ohio, have invented a new and useful Improvementin Universal Feed Mechanism for Sewing l lachines of which the following is a specification.

My invention relates especially to sewing machines having afeed shaft for the; goods, such as are employed in blind stitch sewing machines, although it may be applied to machines of other types.

I will show and describe my device as applied to a blind-stitch sewing machine.

An object of my invention is to provide a feed mechanism'whereby the feed may be so modified that the number of stitches per inch may be readily and accurately varied and; controlled.

Another object of my inventionis to provide a feed mechanism in which the parts are so housed that they will offer no re sistance to the material that is being fed, and that the parts will not be obstructed in their operation by the material being fed thru such machine.

Another object is to provide a simple and eflicient device for the purpose stated.

These and other objects are attained by the means described herein and disclosed in the accompanying drawing in which:

Fig. 1 is a fragmental side elevation of a blind stitch sewing machine to which a device embodying my invention has been applied.

Fig. 2 is a sectional view on line 2-2 of Fig. 1. t

Fig. 3 is a fragmental sectional view on line 33 of Fig. 1.

The housing A. containing within it a ratchet mechanism, is mounted on the feed shaft B, and is rotatably reciprocated by means of the rod G mounted upon the feed arm D that is rotatably reciprocated by the rocker shaft E. The feed shaft 13 has mounted on it a series of feed rollers, not shown that engage and. feed the material to be sewed to the needle, not shown.

The housing A comprises a case a, a back a, and a cover (L The feed shaft B extends thru the back a and has mounted upon it, interiorly to the case a, a ratchet wheel I) secured to shaft B by set screw 5'. v The back a is adapted to be rotatably re- Gonnisnno, a

and is held in such en justably mounted upon ciproca ted upon the" shaft B. Ac pawl a mounted uponthe back a interiorly to the caseynormally engag s the ratchet wheel I) ement by the spring c 'niounted on the interior of the case. The

cover atextends over one side of the case and encases the ratchet mechanism within such case. r'rlug a extends fronithe case and'has pivotally mounted upon it oneend of the rod C. The other end of the rodis adthe feed arm D. Th feed arm shaft cZ upon which the feed arm collar 03 is mounted, is supported above the base F of the machine by means of the bracket 7. The feed arm collar has a slotted arm D along the slot (Z of which the one end of the rod 0 may be moved, and at intermediate places "of which the rod C may be secured by means of the screw (Z and the lock nut (Z A gear segment (Z is formed on the collar cl, said gear segment engaging ported on and above the shaft (Z by means of the links d and (Z The rocker arm E operated by the eccentric G is mounted on the shaft e The collare' is secured upon gear segment 6 formed ,on the rocker shaft. collar e mounted on the rocker shaft 8 supthe rocker shaft 6 by means of set screw 0 The operation of device is as follows: The eccentric Gr imparts an oscillatory and rotary motion to the rocker shaft 6 by means of the rocker arm E. This motion of the rocker shaft 6 is transmitted to the collar 6 the gear segment of which engages with the gear segment (Z formed on the feed arm collar thereby rotatably reciprocating the feed arm upon shaft Z. The motion of the feed arm is transmitted to the lug (i formed on the case a, by means of the rod C, where-' by the pawl operative upon the ratchet wheel Z) intermittingly revolves the feed shaft B. By adjusting the rod C to various distances along the feed arm from the center of the shaft (Z. the length'of the stroke of the rod C is varied. whereby thenumber of degrees thru which the shaft tiirned from one forward stroke of the rod C is varied. Adjustment of the rod C is made by loosening the thumb screw 0 and moving the red C to the desired position upon the arm D. whereupon the thumb screw is tightened.

What I claimis:

1. In a feed mechanism the combination with a feed shaft, of a rocker shaft anda l CO another, a rocker arm mounted on. the rocker shaftand adapted to oscillate the rocker shaft, a collar mounted onthe rocker shaft and having gear teeth formed thereon, a feed arm mounted on the feed arm shaft and having gear teeth formed thereon and engaging another, a rocker arm mounted on the rocker shaft and adapted to oscillate the rocker shaft; a collar mounted on the rocker shaft and having gear teeth formed thereon, a feed arm mounted on the feed arm shaft and having gear teeth thereon engaging the teeth on the collar, a ratchet wheel mounted on ..'the feed shaft, a housing encasing the ratchet Wheel, a i pawl interiorly mounted" on the housing and engaging theratchet heel, a

messes rod adjustably mounted atone end on the feed arnn-and a pivot connecting the other end of the rod tothe housing.

8. In a feed mechanism the combination Witha feed shaft, of a rocker shaft and a -teed arm shaft mounted adjacent to one an other a rocker arm mounted on the rocker shaft adapted to oscillate the rocker shaft, a gear segment mounted on the rocker shaft a feed arm' mounted on the feed arm shaft having gear teeth engaging the T gear segment, the feed arm having anielo'ngated slot extending substantially: radially to theiaX-is of the. feed arm shaft, a ratchet. mechanism mounted onthe feed shaft, a: rodpivotally connected at one end with the. ratchet mechanis1n,;and having itsfother end extending into the slot in the feed arm and adapted to e i djust d ongitudinally hereof.

. In witness flwhereofiil haye hereunto sub? I scribed my name; this 30th day .of July, 1920; JACOB GOLDBERG. 

